$ git clone -n https://src.fedoraproject.org/rpms/kchmviewer.git /var/lib/mock/f40-build-2292301-56121/root/chroot_tmpdir/scmroot/kchmviewer
Cloning into '/var/lib/mock/f40-build-2292301-56121/root/chroot_tmpdir/scmroot/kchmviewer'...
$ git fetch origin 7750e4f74f11bc3a6916cf1e175a9c8b863a0d76:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kchmviewer
 * [new ref]         7750e4f74f11bc3a6916cf1e175a9c8b863a0d76 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7750e4f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild